Hi there, I won't make this topic long but I am trying to design a PV system but I have too many loopholes in my knowledge as most of the instructions use different techniques.

Firstly, I need a daily amount of at least 900 litres lifted through a 15m TDH(including frictional losses). I tried to measure the flow rate required comparing it to the sun peak hours. Here is what I did.

In order to find the energy required by the pump I did: (Volume req per day *TDH*g*density of water)/3.6*10^6). Then to find the power for solar array (E/sunpeakhr*F*E).

When I do this calculation I have values which I cannot even deal with(values too small). Though I did find out it requires around 20W (somehow) looking through some performance curves of pumps but is there any other way to find the power used by the pump?

Secondly, if the power is found how do I size my array to fit that power accordingly? Any simplistic equations that I am missing?

If anyone can help me out I shall send you a lot of love and peace. Thanks!

TLDR(please read if you can): how to find power ratings for pump using calculations and solar array sizing to fit it.

-friend in need of help

EDIT: water source is through mains. thanks!

Firstly, I need a daily amount of at least 900 litres lifted through a 15m TDH(including frictional losses). I tried to measure the flow rate required comparing it to the sun peak hours. Here is what I did.

In order to find the energy required by the pump I did: (Volume req per day *TDH*g*density of water)/3.6*10^6). Then to find the power for solar array (E/sunpeakhr*F*E).

When I do this calculation I have values which I cannot even deal with(values too small). Though I did find out it requires around 20W (somehow) looking through some performance curves of pumps but is there any other way to find the power used by the pump?

Secondly, if the power is found how do I size my array to fit that power accordingly? Any simplistic equations that I am missing?

If anyone can help me out I shall send you a lot of love and peace. Thanks!

TLDR(please read if you can): how to find power ratings for pump using calculations and solar array sizing to fit it.

-friend in need of help

EDIT: water source is through mains. thanks!

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